Blow-off valve.



0 J. BERGO.

BLOW-OFF VALVE.

APPLICATION man JUNE 1, 1914.

1,166,884; Patented Jan. 4, 1916.

2 SHEETS-SHEET 2 um zz iii C311 uevltoz 01:0 Jfieiyo illfozues UNITEDSTATES PATENT OFFICE.

OTTO J. BERGO, OF NORFOLK, VIRGINIA, ASSIGNOR OF ONE-HALF TO THOMAS 3'.

WHITE, OF NORFOLK, VIRGINIA.

BLOW-OFF VALVE.

To all whom it may concern:

Be it known that I, O'r'ro J. BERGO, a citizen of the United States,residing at Norfolk, in the county of Norfolk and State of Virginia,have invented new and useful Im- I provements in BloW-Ofl' Valves, ofwhich the following is a specification.

This invention relates to valves, and has particular reference to thatcharacter of valve known as blow-off valves used particularly inconnection with steam boilers.

An object of this invention is to provide a valve which will insure theclosing of the same-under practically all conditions. In valves of thistype heretofore invented no provision was made for taking care of thescale and other sediment accumulating in boilers and pipes, and whichare by degrees carried into the valve casing. This scale or sedimentlodges in the corners of the valve casing and accumulates about thevalve seat to such an extent as to prevent the complete shutting off ofthe fluid passage through the valve.

Another object of the invention is to provide a valve casing with apassage therethrough having a plurality of valves and their respectiveseats controlling the single fluid passage, these valves beingselectively or simultaneously controlled and operated by means of asingle handle exterior of the valve casing.

In carrying out these objects the valve of this invention comprises,broadly, a casing having a fluid passage therethrough with an inner orsmall valve seat and a correspondingly small valve for said seat toclose the fluid passage. A second and larger valve seat is arrangedoutside of the small valve seat and is provided with a correspondinglylarge valve which also closes the fluid passage. A handle is mountedupon the stem of the larger valve so as to raise and lower the same. Theinner valve has a stem adjustably connected to the larger stem wherebythe. inner valve may be operated simultaneously with the larger valve,may be operated in advance thereof so as to seat prior to the completeclosing movement (if the larger valve, or may be adjusted to ad- .initthe larger valve closing prior to the complete closing movement of theinner valve. I

The above and other objects and advantages of this invention will morefully ap- Specification of Letters Patent.

Patented Jan. 4, 1916. 1914. Serial No. 842,093.

I pear from the following detail disclosure of the present embodiment ofthis invention, the same being shown in the accompanying drawingswherein- Figure 1 is a vertical central section taken through the deviceshowing the valves closed and adjusted for simultaneous operation. F 1g.2 is a similar view showing the inner valve closed and the stemsadjusted to operate the inner valve. Fig. 3 is a similar View disclosingthe outer valve closed and the stems adjusted to operate the outer valveonly.

Referring to these drawings 10 designates a valve casing having thelateral inlet port 11 and the bottom outlet port 12. Located valve seat13 counter-sunk in the bottom of the valve-casing 10 and detachablysecured in place, preferably by means of threads as shown. The valveseat 13 is provided with an upstanding reduced portion externallythreaded to receive the internally threaded outer valve seat 14. Thevalve seat 14 threaded over the inner valve seat 13 bears againstthe'bottom of the valve casing 10 and the top of the inner valve seat13. An outer stem 15 is mounted in the casing 10 for rotation and alsofor Vertical movement. The stem 15 passes through the top 16 of thecasing which latter is recessed or counterbored about the valve stem 15to receive a suitable packing 17 held in place by a gland 18 forcedagainst the packing in any suit-v able manner as by the headed bolts 19.The' stem 15 has an exteriorly threaded portion near its upper end,which portion passes through an internally threaded yoke 20 carried.upon the cap or top 16 of the valve casing and constituting a means forraising and lowering the valvestem when turned.

Above the threaded portion the stem '15 is is held to the stem 1) a nut26 closely fitting the stem, engaging t e flange '24 and having threadedconnection with the inner wall of the valve 25. It is thus seen that thenut 26. holds the valve upon the stem 15 and at the same time admits ofthe free turning of the stemwithin the valve. Y

A second or.inner stem 27 is mounted for rotation in the outer stem 15,the inner stem having an annular flange 28 upon its lower end seated ina recess in the upper face of an inner or second valve 29, the latterbeing held for vertical movement with the stem 27 by means of a nutengaging in threaded relation within the opening in the valve 29 andbearing against the flange 28. The outer valve 25 is adapted to restupon the outer seat 14; and is chambered or hollowed out at its lowerend as shown at 31 in the drawing, to receive the inner valve 29. Theinner valve 29 is'adapted to rest'upon the inner valve seat 13 to closethe fluid passage through the casing 10.

The upper end of the inner stem 27 is provided with an angular portion32 receiv: ing thereupon the upper endof a connecting cap 33 whichlatter is enlarged at its lower end and engages in threaded relationupon the externally threaded extension of the outer stem 15. The cap 33is locked from movement upon the extension by a jam nut 34; the latterhaving preferably a beveled upper face engaging a correspondinglybeveled face upon the lower end of'the cap 33. The cap is held upon theupper end of the stem 27 by a pair of jam nuts 35 which engage over areducedexternally threaded projection of the inner valve stem 27.

For the purpose of facilitating the removal of the inner valve 29fromits stem,

the valve is provided upon its lower end with a depending angular shank36 adapted to "receive a wrench or the like to hold the valve fromrotation When its securing nut 30 is turned. The inner valve seat 13,which is threaded in the casing, has inwardly extending lugs 37 adaptedto receive thereagainst a suitable tool for turning and removing thevalve seat. In order to prevent any possible leakage between the innerand outer valve stems at their upper ends, the stem 27 is provided uponits upper end with a ground beveled face 38 engaging a correspondinglyaiaaeee formed face within the top of the cap, and a packing 39 .isplaced within the top of the cap for engagement about the inner stem 27and against the upper extremity of the outer stem 15.

When the parts are adjusted as shown in Fig. 1, and the-handle turnedthe outer valve stem 15 is turned through the yoke 20, raising not onlythe valve stem 15 and its valve .25 but also the inner valve stem 27 andits valve 29.

When the device is adjusted as shown in Fig. 2, it will be noted thatthe cap 33 and its jam nut 34 are moved down toward the handle 21, suchadjustment moving the inner -stem 27 down through the'outer stem andverse adjustment from that shown in Fig. 2, or wherein the connectingcap 33 is raised upon the outer stem extension to thus draw the innerstem 27 up within the outer stem and move the inner valve 29 up withinthe chamber 31 of the outer valve. The inner valve. 29 is now held upwithin the outer valve whereupon the latter is first brought to its seatwhen the handle is turned, such position being shown in Fig. 3.

What is claimed is In a blow-off valve the combination with a hollowstem, a valve on said stem, a second stem within said first stem, and asecond valve on said second stem, of adjustable means between saidstems, comprising a cap adapted to be secured on the end of said secondstem and adapted to engage for relative movement with said first stem,means for locking said cap against movement on said second stem, and apacking within said cap between said stems.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

OTTO J. BERGO.

' Witnesses:

REGINALD J. B. PAGE, W. K. FENTIRESS.

In Fig. 3 of the" drawing is shown the re-

